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TB42 carby problem?

Tech Talk for Nissan owners.

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TB42 carby problem?

Post by 351ciofgrunt »

Hey guys
I've got a GQ with a TB42 carby and its got a problem where it is holding revs and only slowly dropping back down to idle. It does this free revving in neutral and whilst driving.

If in neutral i can rev it to say 3500rpm, take the foot off the accelerator and it will take awhile to drop back to idle.

If im driving and changing up gears then the revs will only drop when i let the clutch out in the higher gear.

The throttle spring seems fine, I'm suspecting its some sort of anti-pollution set up?

any ideas?
GQ Patrol Wagon, 6 point roll cage
351 cleveland, CHI heads, solid cam, Funnelweb single plane, 750 HP DP
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Post by tj81 »

I beleive this is fairly common, however i cant remember the resolution to the issue off the top of my head.

I vaguely remember a return to idle adjustment that may be required
92 LWB Ford Maverick 4.2, Dual Fuel.

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carby

Post by micks troll »

The plastic rocker that comes off the accelerator cable can stick and cause trouble, otherwise spray silicon spray up your cable as it is most probably sticky. (best to clean with carby cleaner first around the rocker, and blow out the accelerator cable with compressed air). This should fix your problem.
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Post by PGS 4WD »

The BCDD (Boost control deceleration device) can cause this.

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Re: TB42 carby problem?

Post by flicka »

Sorry to activate an old thread but I have the same problem, did you find a fix for this?
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Re: TB42 carby problem?

Post by 351ciofgrunt »

Yeah it turned out to be a vacuum leak, but I can't remember where from, sorry.
GQ Patrol Wagon, 6 point roll cage
351 cleveland, CHI heads, solid cam, Funnelweb single plane, 750 HP DP
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